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Review reviewHigh

CVE-2025-39880

Linux Linux, linux kernel, debian linux

In the Linux kernel, the following vulnerability has been resolved: libceph: fix invalid accesses to ceph_connection_v1_info There is a place where generic code in messenger.c is reading and another place where it is writing to con->v1 union member without checking that the union member is active (i.e. msgr1 is in use). On 64-bit systems, con->v1.auth_retry overlaps with con->v2.out_iter, so such a read is almost guaranteed to return a bogus value instead of 0 when msgr2 is in use. This ends up being fairly benign because the side effect is just the invalidation of the authorizer and succes...

CVSS
7.8
EPSS
0.30%
22.4% percentile
CISA KEV
Not listed
Published
2025.09.23
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.30%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: libceph: fix invalid accesses to ceph_connection_v1_info There is a place where generic code in messenger.c is reading and another place where it is writing to con->v1 union member without checking that the union member is active (i.e. msgr1 is in use). On 64-bit systems, con->v1.auth_retry overlaps with con->v2.out_iter, so such a read is almost guaranteed to return a bogus value instead of 0 when msgr2 is in use. This ends up being fairly benign because the side effect is just the invalidation of the authorizer and succes...

Affected product and versions

Product
Linux Linux, linux kernel, debian linux
Affected versions
>= cd1a677cad994021b19665ed476aea63f5d54f31 < ea12ab684f8ae8a6da11a22c78d94a79e2163096, >= cd1a677cad994021b19665ed476aea63f5d54f31 < 591ea9c30737663a471b2bb07b27ddde86b020d5, >= cd1a677cad994021b19665ed476aea63f5d54f31 < 23538cfbeed87159a5ac6c61e7a6de3d8d4486a8, >= cd1a677cad994021b19665ed476aea63f5d54f31 < 35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983, >= cd1a677cad994021b19665ed476aea63f5d54f31 < 6bd8b56899be0b514945f639a89ccafb8f8dfaef, >= cd1a677cad994021b19665ed476aea63f5d54f31 < cdbc9836c7afadad68f374791738f118263c5371, >= 5.11, >= 5.11 < 5.15.194, >= 5.16 < 6.1.153, >= 6.2 < 6.6.107, >= 6.7 < 6.12.48, >= 6.13 < 6.16.8, 6.17, 11.0
Fixed versions
5.15.194, 6.1.153, 6.6.107, 6.12.48, 6.16.8

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel, debian linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-704